OTTAWA, ON - JUNE 30: The Duke and Duchess of Cambridge during an informal reception for young Canadian volunteers in the official residence of the Governor General of Canada, Rideau Hall in Ottawa, on the first day of their visit to the Commonwealth country.  The Royal couple will also join millions of Canadians to take part in tomorrow's Canada Day celebrations which mark Canada's 144th Birthday.  (Photo by John Stillwell-Pool/Getty Images)
OTTAWA, ON - JUNE 30: The Duke and Duchess of Cambridge, with Canadian Prime Minister Stephen Harper, during an informal reception for young Canadian volunteers in the official residence of the Governor General of Canada, Rideau Hall in Ottawa, on the first day of their visit to the Commonwealth country.  The Royal couple will also join millions of Canadians to take part in tomorrow's Canada Day celebrations which mark Canada's 144th Birthday.  (Photo by John Stillwell-Pool/Getty Images)
OTTAWA, ON - JUNE 30: The Duchess of Cambridge with Canadian Prime Minister Stephen Harper (right), during an informal reception for young Canadian volunteers in the official residence of the Governor General of Canada, Rideau Hall in Ottawa, on the first day of her visit to the Commonwealth country.  The Royal couple will also join millions of Canadians to take part in tomorrow's Canada Day celebrations which mark Canada's 144th Birthday.  (Photo by John Stillwell-Pool/Getty Images)
OTTAWA, ON - JUNE 30: The Duchess of Cambridge during an informal reception for young Canadian volunteers in the official residence of the Governor General of Canada, Rideau Hall in Ottawa, on the first day of her visit to the Commonwealth country.  The Royal couple will also join millions of Canadians to take part in tomorrow's Canada Day celebrations which mark Canada's 144th Birthday.  (Photo by John Stillwell-Pool/Getty Images)